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authorGuillaume Chazarain <guichaz@yahoo.fr>2008-01-25 21:08:34 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-25 21:08:34 +0100
commitcc203d2422004498909c4886d1b94a2e388d973e (patch)
tree10fd9f364bda783b7354cf0e7d04ba319899c079 /kernel
parent782daeee3d596282bfee4cd9e976c86be0e194a8 (diff)
downloadlinux-cc203d2422004498909c4886d1b94a2e388d973e.tar.bz2
sched: monitor clock underflows in /proc/sched_debug
We monitor clock overflows, let's also monitor clock underflows. Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c6
-rw-r--r--kernel/sched_debug.c1
2 files changed, 5 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 3995d1679858..4d3a5a700866 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -465,7 +465,7 @@ struct rq {
u64 clock, prev_clock_raw;
s64 clock_max_delta;
- unsigned int clock_warps, clock_overflows;
+ unsigned int clock_warps, clock_overflows, clock_underflows;
u64 idle_clock;
unsigned int clock_deep_idle_events;
u64 tick_timestamp;
@@ -3736,8 +3736,10 @@ void scheduler_tick(void)
/*
* Let rq->clock advance by at least TICK_NSEC:
*/
- if (unlikely(rq->clock < next_tick))
+ if (unlikely(rq->clock < next_tick)) {
rq->clock = next_tick;
+ rq->clock_underflows++;
+ }
rq->tick_timestamp = rq->clock;
update_cpu_load(rq);
curr->sched_class->task_tick(rq, curr, 0);
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 80fbbfc04290..9e5de098d471 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -179,6 +179,7 @@ static void print_cpu(struct seq_file *m, int cpu)
PN(prev_clock_raw);
P(clock_warps);
P(clock_overflows);
+ P(clock_underflows);
P(clock_deep_idle_events);
PN(clock_max_delta);
P(cpu_load[0]);